Polyurethane thermoplastic elastomers with macroheterocyclic fragments in the main chain

Polyurethane thermoplastic elastomers with macroheterocyclic fragments in the main chain 

Polyurethane-semicarbazides based on crown ether sulfonyl derivatives 

The incorporation of macroheterocyclic compounds and their derivatives in polymer structures leads to the obtaining of polymers with specific behavor upon complex formation [3,11,12]. Polyurethane-semicarbazides comprising crown ether sulfonyl derivatives in the main chain were obtained by a conventional two-stage method [13-16]. The structure of the repeat unit of the resulting crown ether-containing thermoplastic elastomers XXI can be represented as  

The crown ether-containing thermoplastic elastomers obtained are soluble in amide solvents (DMF, DMA, DMSO). Their intrinsic viscosity, [rj, is within the range of 0.22 to 0.41 dL/g (in DMF at 25°C). 

Sample Oligo- ether Diiso- cyanate Chain extender (end-group) (7 (MPa) (%) 

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